Hi lizzog
Depending when you started peri-menopause - when you last had a natural period, unless you are having a late menopause, it is unlikely - though not of course impossible - that it is your natural periods. Also depends how often they are, the bleeds? The main thing though is that your womb lining is OK - presumably not too thick?
You haven't mentioned what your oestrogen dose is and I presume you are taking 100 mg utrogestan?
I have only ever taken it vaginally but I don't sleep so well when I'm on the Utrogetsan phase (I take it cyclically) - partly because it gives me vivid dreams, but also irritates my bladder so I have to get up in the night to pee.
In terms of sweats - some women do find that they get increased flushes on the utro phase and some women increase their oestrogen dose during this phase - (maybe the utro interferes with the beneficial effect of oestrogen in some way?) but if you're taking it continuously, then a permanent increase in oestrogen is a possible solution - as sheila has already suggested.
Hurdity x